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Quarterly Monitoring Report,October, 1998 Canepa's Car Wash(Park Street) 1.. November 18, 1998 Page 4 �+. sheets indicating analytical methods used, detection limits, and the results of the analyses are included in Appendix C. Historical groundwater analyses are presented in Table A,Appendix B. TABLE 2 LABORATORY ANALYTICAL RESULTS(OCTOBER 1998) B T E X MTBE Other TPH-G Oxygenates/ 46- Additives MONITOR Detection 0.3 0.3 0.3 0.6 1.0 See Laboratory 0.05 WELL! DATE Limits--- µg/1 lie] lig/1 µg/1 po Report Sheet mg/1 ` SAMPLE Sample I.D. MW-1 10/21/98 2038-MW1-10/21/98 ND 0.9 ND 2.0 ND ND 0.08 i.. MW-2 10/21/98 2038-MW2-10/21/98 310 150 370 520 ND ND 15 MW-3 10/21/98 2038-MW3-10121/98 0.6 4.3 1.9 1.2 ND ND 0.4 MW-4 10/21/98 2038-MW4-10121/98 ND ND ND ND 1.0 ND ND MW-5 10/21/98 2038-MW5-10/21/98 3,000 1,400 540 690 ND 7.6(DIPS) 19 MW-6 10/21/98 2038-MW6-10121198 0.3 1.6 0.4 ND 13 ND 0.06 MW-7 10/21/98 2038-MW7-10/21/98 0.4 1.9 ND ND ND ND 0.1 16, Unit Conversions: Ana! tical µgll:parts per billion(ppb) B,T,E,X=benzene,toluene,ethyl benzene,and total xylenes. rno:parts per million(ppm) TPH-G W total petroleum hydrocarbons,quantified as gasoline. MTBE=Methyl tertiary Butyl Ether. b.+ Other Oxygenates/Additives—ethanol,Di-isopropyl ether(RIPE),Ethyl tertiary-Butyl Ether (ETBE),tertiary-amyl Methyl Ether(TAME),and tertiary-Butanol. ND=none detected at or above reported laboratory detection limit. i.. 5. DISCUSSION OF RESULTS Since September, 1994, the depth to groundwater at the site has generally decreased from approximately 46 to 24 feet bgs. The average depth to groundwater measured during the October groundwater monitoring event was approximately 24.6 feet below the monitor well measuring points. The groundwater elevation ranged from i" 12.65 to 14.40 feet bmsl. The groundwater elevation contour map (Figure 3, Appendix A) indicates that the groundwater gradient at the site is generally towards the northeast. This is consistent with previous monitoring results. A hydrograph of monitor wells MW-1 through MW-7 (Figure 4, Appendix A) illustrates the fluctuation of the groundwater table. Historical groundwater measurements are provided in the accompanying Hydrograph Table(Appendix A). `- The laboratory analytical results for the October, 1998, groundwater monitoring event are generally consistent with the laboratory analytical results for the July, 1998, groundwater monitoring event. None of the analytes of concern were detected in the groundwater sample collected from monitor well MW-4, with the exception of �- MTBE, which was detected at a low concentration. TPH-G and all BTEX constituents were detected in the samples collected from MW-2, MW-3, and MW-5. Low concentrations of toluene, total xylenes, and TPH-G c.. L� CONDOR i..